<template>
  <div :class="className" :style="{ height: height, width: width }" />
</template>

<script>
import echarts from "echarts";
require("echarts/theme/macarons"); // echarts theme
import resize from "../../dashboard/mixins/resize";
import moment from "moment";

export default {
  mixins: [resize],
  props: {
    className: {
      type: String,
      default: "chart"
    },
    width: {
      type: String,
      default: "100%"
    },
    height: {
      type: String,
      default: "300px"
    },
    autoResize: {
      type: Boolean,
      default: true
    },
    chartData: {
      type: Object,
      required: true
    }
  },
  data() {
    return {
      chart: null
    };
  },
  watch: {
    chartData: {
      deep: true,
      handler(val) {
        this.setOptions(val);
      }
    }
  },
  mounted() {
    this.$nextTick(() => {
      this.initChart();
    });
  },
  beforeDestroy() {
    if (!this.chart) {
      return;
    }
    this.chart.dispose();
    this.chart = null;
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, "macarons");
      this.setOptions(this.chartData);
    },
    setOptions({ barChartData, dataTime } = {}) {
      let curYear = moment(dataTime).year();
      let yearArr = [curYear - 3, curYear - 2, curYear - 1, curYear];
      let option = {
        tooltip: {
          trigger: "axis",
          axisPointer: {
            // Use axis to trigger tooltip
            type: "shadow" // 'shadow' as default; can also be 'line' or 'shadow'
          }
        },
        legend: {
          textStyle: {
            color: "#fff"
          }
        },
        grid: {
          left: "3%",
          right: "4%",
          bottom: "3%",
          containLabel: true
        },
        barWidth: "40%",
        xAxis: {
          type: "category",
          data: yearArr
        },
        yAxis: {
          type: "value"
        },
        series: barChartData.map(item => {
          return {
            name: item.energyUnit,
            type: "bar",
            stack: "total",
            label: {
              show: true
            },
            emphasis: {
              focus: "series"
            },
            data: item.dataArr
          };
        })
      };
      this.chart.setOption(option);
    }
  }
};
</script>
